无法访问tomcat管理器GUI（Tomcat9 + Java9）

Question

I am using tomcat version 9.0.1. Running on a linux machine using java 9.

in my tomcat-users.xml i have added below

<role rolename="manager-gui"/>
<role rolename="manager"/>
<role rolename="manager-script"/>
<user username="admin" password="admin" roles="manager-gui,manager,manager-script"/>

in my server.xml added below line after googling

<Realm className="org.apache.catalina.realm.MemoryRealm" />

After that i started by tomcat server, while accessing the maneger gui getting below error

403 Access Denied

You are not authorized to view this page.
If you have not changed any configuration files, please examine the file conf/tomcat-users.xml in your installation. That file must contain the credentials to let you use this webapp.

please help

tomcat-users.xml

<tomcat-users xmlns="http://tomcat.apache.org/xml"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://tomcat.apache.org/xml tomcat-users.xsd"
              version="1.0">

<role rolename="manager-gui"/>
<role rolename="manager"/>
<role rolename="manager-script"/>
<user username="admin" password="admin" roles="manager-gui,manager,manager-script"/>
</tomcat-users>

Answer 1

I think the solution for the 403 ERROR is adding your IP/IPs to the file

webapps/manager/META-INF/context.xml

in the section:

<Valve className="org.apache.catalina.valves.RemoteAddrValve"  allow="X.X.X.X"/>